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<?php print_r(unserialize('a:1:{s:5:"title";a:2:{s:3:"mul";a:3:{s:3:"mul";s:4:"Home";s:2:"en";s:4:"Home";s:2:"de";s:4:"Home";}s:2:"de";s:4:"Heim";}}'));
Output for 4.3.0 - 7.1.0
Array ( [title] => Array ( [mul] => Array ( [mul] => Home [en] => Home [de] => Home ) [de] => Heim ) )